Collegian Tree Gelbman wakes up in horror to learn that she\'s stuck in a parallel universe. Her boyfriend Carter is now with someone else, and her friends and fellow students seem to be completely different versions of themselves. When Tree discovers that Carter\'s roommate has been altering time, she finds herself once again the target of a masked killer. When the psychopath starts to go after her inner circle, Tree soon realizes that she must die over and over again to save everyone.
A bioengineering company releases a new product: Mungoes, human beings who have been stripped of all memories, feelings, and free will. They are stoic, docile, perfect for menial labor. The lead engineer, however, has bigger ideas for them, and begins secretly implanting them with artificial memories and emotions—and even the ability to love.